Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. In the marked diagonals no digit can appear more then once. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. In the marked diagonals no digit can appear more then once. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Locate the position of the 16 T-forms in the grid. The T-forms fill all cells and don't overlap. The forms can be rotated but not reflected. Every row, every column, every marked 4x2 box and both main diagonals contain the digits 1 through 8. The place of 3 T-forms is given.

Connect in the left grid all dots in pairs in such a way that all cells are filled. Each straight line must be at least 2 cells long. After that fill in the right grid so that every row, every column and every 3x3 box contain the digits 1 through 9. If two cells are in the left grid in the same path (snake) then the corresponding cells in the right grid must be different.

Connect in the left grid all dots in pairs in such a way that all cells are filled. Each path (worm) has to make a 90 degree turn in every cell it travels through and must contain at least one turn. After that fill in the right grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. If two cells are in the left grid in the same path (worm) then the corresponding cells in the right grid must be different.